Diagnosis and differential diagnosis The diagnosis of spastic squint can be determined by the patient’s head and neck tilt, with non-stop shaking or trembling, but the diagnosis also needs to meet the following two points: a. The patient has dystonia; b. Such other diseases are excluded. 1. Hysterical squint: there are psychogenic factors that cause the disease, the attack is sudden, the head and neck activities are variable, and there is no certain pattern, the symptoms can be slowly relieved with emotional stability after suggestion. 2, congenital squint: mostly in children, formed before birth, mainly manifested as sternocleidomastoid muscle contracture, not hypertrophy, no clonus . 3.Secondary neurogenic squint: cervical spine tumor, injury, osteoarthritis, cervical tuberculosis, etc. can lead to this disease. Cervical disc herniation, occipital neuritis, etc. can cause ankylosing squint due to the stimulation of the nerves and muscles in the neck. The vagal squint caused by stimulation of one side of the semicircular canal, ophthalmic squint caused by congenital oculomotor balance disorder, bony squint caused by congenital cervical spine deformity, congenital sternocleidomastoid contracture and squint caused by early cerebellar tumor of the fourth ventricle, etc., are not differentiated by clonus and require further incision to check the cause. 4.Delayed dyskinesia: It occurs after long-term use of certain antipsychotic drugs, mainly manifesting as involuntary movements of the mouth, face and neck muscles, and gradually relieving and self-healing after stopping the drugs. 5.Generalized dystonia: spastic diagonal neck can be the initial manifestation of generalized dystonia or part of generalized dystonia, which can be distinguished according to the disease regression and the extensiveness of symptoms.